Type-writer-platen-checking device.



A. E. ZUMPEL. T YPE WRITER PLATEN GHEGKING DEVICE. APPLICATION FILED001212, 191g.

' a I Nd wi/l'wcooeoz vwe M'oz Patented Feb. 7, 191 1.

ARTHUR E. ZUMPE, or ENGLEWOOD, NEW JERSEY.

TYPE-WRITER PLATEN-CHECKING DEVICE.

Specification of Letters Patent.

Patented Feb. '7, 1911.

Application filed October 12, .1910. Serial No. 536,602.

To all whom it may concern:

Be itknown that I, ARTHUR E. ZUMP'E, a citizen of the United States,residing at Englewood, county of Bergen, and State of New Jersey, haveinvented a new and Improved Type-W'riter-Platen Checking Device, ofwhich the following isa specification.

' This invention relates to a novel attachment for typewriter platens bymeans of which the advance of thel'atter and the feed of thepaper beyonda desiredand-predetermined line is automatically checked.

It is desirable thatin writing a number offpages, t e written mattershould terminate atthe-same line on each page, sothat a uniform bottommargin is provided. and aneat appearance of the gathered sheets isinsured. In order to obtainthis desirable result, .with the platenshitherto used, the

oper :tor had always to bear'in mind not to write beyond av certainline. In this wayhis attentionwas detracted from. thewritwhilequitefrequently he would write beyond the desired'terminal line, owing to hisfailure to stop the platen feed at the proper moment.

By my invent1on, the advance of the platen maybe automatically checkedat any predetermined point,'so as to render it impossible fortheoperator to write beyond the line selected asthe bottom of the pa e.

" In the accompanying'drawing: Figure 1 is a front view of part of aplaten provided with my improved checking device; Fig- 2 a cross sectionon line 2 -2, Fig. 1; Fig. 3

an enlarged longitudinal section through the knob i Fig 4: a plan viewthereof; Fig. 5 a perspective iew of the stop lever, and

Fig. 6 a'face view'of-the toothed collar.

, The numeral 10 indicates the rotative typewriter platen provided withthe conventional feed ratchet wheel 11, theaxis 12 of'the' platen beinghiing in the carriage frame'13 all-as usual. Near its free end,

shaft 12 is provided with a relatively fixed collar-14 which isaccommodated by a corresponding inner recess 15 of aknob Al Thejlat-teris-freely-rotatable. on shaft 12 and is =p'refer ab ly composed of acylindrical body lfi andan enlarged flanking rim -17,

which"may berea dily grasped by the operator. 'At-its outer'face, collar'14 is provigled with a'serie's of teeth 18 which are adapted to beengaged by the correspondin teeth 1-9 of knob A, the parts 14, 16c'onst1- tut-ing respectively fixed and movable coupling members. Teeth18, 19 are normally maintained in operativeengagement by a spring 20,interposed between an inwardly extending flange 21 of knob A and adisk22 secured to the free end of shaft 12 by ar ac-- forms part of a splitsleeve 28 that slidablyencompasses a pin 29 secured to a holder 30 offrame 13. Detent 27is provided with an upturned finger piece 31. so thathook; 26

may be readlly brought into'oroutof en gagement' with groove 25 bycorrespondingly turning the detent on pin 29. In

order to prevent an accidental disengagement of hook 26 from groove25'.and to maintain the stop lever in its raised position wheneverdesired, pin 29 is made angular (Figs. 1 and 2) while the free inneredge 32 of the split sleeve 28 is turned slightly inward (Fig. 5), thusproviding a springy connection between pin and sleeve.

The length of spiral groove 25 should be such as to permit thelrota-tionof platen 10 to such an extent that asheet of conventional size maybefilled with writing, while leaving the customary margins at top andbottom. If it is desired to write a page, detent 27 is raised, the sheetis applied'to platen 10 and knob A is turned forward to rotate saidplaten until the sheet islin proper position for the starting of thewriting. Detent 27 is outward to disengage teeth '19 from teeth 18.

The knob is then turned backward until hook 26. owingto the springyconnection between parts 28, 29, enters groove 25 and abuts against therear wall 33 of' the widened end 34 of said groove, whereupon the knobis released to effect a rengagement between teeth 18, 19. The writing 1sthen startedduring which operation, platen 10 is intermittently advancedby actuating the customary feed mechanism (not shown) that engagesratchet wheel 11. In' this way, ;knob A will also be rotated, and detent27 will be gradually moved outward on in 29 until its hook 26 during thecontinue rota- I -tion ofplate 10 abuts against the end 3501 groove 25.When the operator attempts to again actuate the platen feed.mechanism,he

will ascertain that the platen cannot be further advanced and he willthus be advised without inspect-ion or other mental efiort that the pageis 'full. After throwing back detent 27, the sheet may be removed fromthe typewriter, whereupon the operation is repeated. Means shouldfurther be provided that effect a checking of the paper feed before thedetent 27 engages the end of groove 25 so that the device may be set forlar er and smaller pages. For this purpose, a p urality of spacedsockets 36 issh'own to be formed in the bottom ofgroove 25 which areadapted for the reception of a plug or stop 37 having grip 38, but it isobvious that other convenient means may be rovided for rendering part ofgroove 25'ine ectivewithout departing from the spirit of my inven-.tion. These pockets may be numbered as shown in Fi 1 to constitute ascale by -form1ty in the filled pages.

means of which the number of line spaces may be ascertainedthrough whicha rotationof platen 10 may take place before hook 26 will strikestop 37.By selecting the proper socket 36 for lug 37 the device may thus be setto any esired number of lines. To prevent hook 26 from enteringthe'op'en sockets 36, the former is provided with a pair of shoulders 39adapted to ride on the periphery of cylinder 16. I

It will be seen that by my invention, the writing may be automaticallystopped at any desired distance from thebottom of the page, thusobviating frequent inspect-lon by the operator and insuring neatness andum- I claim: p

1. In a device of the character described, a rotative typewriter platen,a shaft carrying the same, a knob on said shaft, said knob' beingadapted to be either coupled to the shaft or to be'rotated independentlytherefrom, and adjustable means cotiperating with the knob for checkingthe rotation 7 thereof.

2. In a device of the character described, a rotatiye typewriterplaten,a shaft carryingthe same, a knob axially displaceable on the shaft andadapted to be coupled thereto,

said knob constituting a handle for manually operating the platen, aspring that tends to maintain the knob and shaft in operativeengagement, and means 'coii'perat'ing with said knob for checking therotation thereof.

3. In a-device of the character described, a rotative typewriter platen,a shaft carry-' ing the same, a knob axially displaceable on the shaftand having a s'iral groove, said I knob constituting a han le formanually operatin' the laten coupling means on said knob an shaft, aspring tends to close pling means on said knob and shaft, a spring thattends to close said coupling means, and a detent removably engaging saidgroove.

5. Inadevice of the character described, a rotative typewriter platen, ashaft carrying thesame, a knob axially displaceable on the shaft andhaving a circumferential j -spiral groove, said knob constituting ahandle for manually operating the platen, coupling means on said knoband shaft, a spring that tends to close said coupling means, and aslidablestop lever. removably engaging said groove.

6. In a device of the character described, a rotativetypewriter platen,ashaft carrying the same, a knob axially displaceable on the shaft andhaving" a circumferential spiral groove,-, said knob constitutingahandle for manually operating-the platen, coupling means on said knoband shaft, a spring that tends to 'close said coupling means, a pin-anda stop lever slidable on said in and adapted to engage said groove.

7. n a device of the character described, a rotative typewriter platen,a shaft carrying the same, a knob which is normally coupled to saidshaft and has a circumferential spiral groove, saidknob constituting ahandle for manually operating the platen,

anadjustable stop in said groove, and a detent removably engaging saidgroove and stopa 8. In a device of the character described.

a laten, a shaft carrying the same, a toothed and having a spiralroove,'.-a.nd a detent adapted to engage sai groove 10. In a deviceof'th character described,

a laten, a shaft carrying the same, a toothed co lar on said shaft, :1toothed sprin -infiuenced knob adapted to engage the col er and having asocketed spiral groove, 8. stop adapted to be fitted into either of thegroove-.-

co lar on said shaft, a toothed spring-influenced knob adapted to engagethe collar,

sockets, and a-detent' adapted to engage said ,7

' groove and stop.-

ARTHUR E. ZULIPE. \Vitnesses:-

FRANK v. 'BRrasEN, Karma-rm; KOCH.

